Dark Souls 3 has its fair share of bosses spread throughout the its vast world. Each boss resides within an area, some areas which are not easily accessible. Most of the bosses in the game are main story bosses and will block your path. However, there are many bosses in the game that are considered Side bosses that you can go and fight at any time, such as the Old Demon King.
Related: Dark Souls 3: All Boss Soul Spells, RankedThis optional boss appears in Smouldering Lake. Reaching it is not complicated, but can take the player by surprise.
The Old Demon King is located in Smouldering Lake. This is an area that is accessible from the Catacombs of Carthus. After killing High Lord Wolnir, go to the bridge before the boss arena, and you need to hit the anchor point. This will make the bridge collapse and allow you to climb down it. At the end of Smouldering Lake is where the Demon King is located.
For the Summonable NPCs, you can summon Great Swamp Cuculus at the bottom of the stairs. You can also summon Knight Slayer Tsorig if you killed him during his invasion. Defeating the boss will get the Soul of the Old Demon King that you can transpose at Firelink Shrine.
Return to Quick Links
Old Demon King has multiple attacks that look similar in many ways, and mostly deal high fire damage.
Swing
The boss swings his hammer at the player, causing melee as well as fire damage. Getting behind or below the boss during this attack is favorable.
Fireball Rain
Old Demon King smacks his hammer on the ground, then lifts it up and moves it around his head, causing Fireball to rain.
Fire Ring
The boss causes a Ring of Fire to move outwards from him to deal damage to any in its path.
Lava Breath
Old Demon King moves his head and spews lava
Read more on thegamer.com